Even though we don't really know what causes miscarriage or how to avoid it, we are learning more and more about reproduction, pregnancy and childbirth all the time. For example, that whole thing about women's spines being different than men's, necessary for carrying a fetus.
We've also been able to use science to go around some natural barriers (or use science to create barriers!) regarding pregnancy. IVF is a great example of that - egg and sperm are fertilized outside of the body, and embryos are implanted in a woman's uterus. What normally happens is that a few embryos are introduced, in the hopes that at least one will take. This can be used if there's a problem with fertilization due to either issues with the woman or man's body. We're seeing an increase in multiple births because of IVF and other fertility treatments.
There are also many who will do pre-implantation genetic diagnosis on the resultant embryos to screen for genetic diseases. If the diseases are mitochondrial, it appears there is a new way to do IVF that involves two women's DNA, and one man's. Mitochondrial DNA is matrilineal, like the Y-chromosome is patrilineal: one can trace a man's genetic line through his Y-chromosome, and woman's through her mitochondrial DNA.
So after IVF, any embryos not used are frozen or thrown out (or adopted, but that's another story) rather than being used for research. At least that's the case for federally funded research in the U.S. With private funds, and in other countries, embryos may not only be researched, but hybrids are developed. Legislators in the U.K. are currently considering allowing human-animal hybrid embryos to be...built? (There are other good points in the article - scroll down to the bullets in the middle.)
Anyway, yesterday the news was full of stories about how prematurely born babies have health problems throughout childhood, and may also have preemies themselves. What the articles mostly focus on is the risk of death throughout childhood - higher for males than females - but not any other particular issues. Do these children, and adults, have more lung problems? Lower cognitive function? Lag in fine motor skill development? You know what else I'd be really curious to know - what's the overall lifetime earnings of these folks? I'm seeing small references to educational problems, so I'm curious about what that toll is, quantifiably.
Multiple births are not only dangerous for the woman, but can also be very dangerous for the babies.
Selective reduction (or selective abortion) is one way to lessen the number of developing fetuses. This, of course, raises some people's ire, and Italy has tried to address the issue through legislation.New ways to perform IVF that don't result in multiples can be incredibly helpful.
IVF also makes for some wacky developing law - when is a person pregnant? Who's a dad? Who's a mom? Can a person be forced to implant an embryo or be estopped from such action? One women in the E.U. is arguing that she was protected by pregnancy laws when her embryos were developing in the clinic, but were not implanted.
Infertility, dangerous pregnancies, sick children, moral and legal ambiguity - fun times.
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